Revolving coal-screen



(No Model.)

W. 0. GUNGKEL. REVOLVING GOAL SCREEN.

No. 410,515. Patented Sept. 3, 1889.

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UNITED STATES PATENT OFFICE.

IVINFIELD O. GUNCKEL, OF TERRE I'IAUTE, INDIANA.

REVOLVING COAL-SCREEN.

SPECIFICATION forming part of Letters Patent No. 410,515, datedSeptember 3, 1889. Application filed January 23, 1888. Serial No.261,657. (No model.)

To all whom it may concern.-

Beit known that I, WINFIELD O. GUNOKEL, a citizen of the United States,residing at Terre Haute, in the county of Vigo and State of Indiana,have invented certain new and useful Improvements in Revolving Coal-Screens; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to coal-screens in which the screen is maderevolnble; and it consists in the novel construction and combination ofthe parts, as hereinafter fully described and claimed, whereby thescreen is driven in an improved manner, and is kept free from dirt.

In the drawings, Figure 1 is a side view of the screen, the casingbeingshown in section. Fig. 2 is a front end view, and Fig. 3 is across-section taken 011 line 0: 0c in Fig. 1.

A is the casing which incloses the screen and which may be framedtogether in any convenient manner.

B is the wire cylinder or screen, the Wires of which are spaced fartherapart toward the rear of the machine, or otherwise arranged to screenthe coal to the best advantage. The screen B is inclined, the rear endbeing the lower.

0 is a band secured to the screen about the middle of its length andprovided with a V-shaped projection c.

D are flat bands secured to the ends of the screen, and E arelongitudinal bars uniting the end bands with the middle band, andsupporting the wire cylinder which is riveted to them. The middle band Cis made rather larger in diameter than the end bands D.

F are two parallel driving-shafts journaled in bearings f, secured tothe casing and situated below the screen, and one at each side of it.These shafts F are provided with sprocketwheels G, connected together bythe chain 9 and driven from the sprocket-wheel g outside the frame.

H are fiat-faced wheels secured 011 shafts F for the end bands D to bearupon.

I are grooved wheels secured. to the shaft F and engaging with theV-shaped projection on the middle band. As the middle band is largerthan the end bands and is situated substantially under the center ofgravity *of the screen, the weight of the screen comes upon the saidgrooved Wheels, and the driving is accomplished by them solely. Thisconstruction insures the screen against slip, the grooved wheels receivethe end-thrust due to the inclination, and the ends of the screen beingsubjected to similar strains the screen will last much longer and notget bent out of shape by being twisted in various directions.

J is a brush of steel wire situated inside the screen and arranged topress against the whole or greater part of its surface at an angle ofabout forty-five degrees. The arrow shows the direction of motion andthe screen meets the brush as the cylindrical surface descends. Thebrush clears the wires from dirt, which falls vertically clear of thebrush, as shown in Fig. 3, so that the brush does not become clogged up.

K are levers which support the ends of the brush outside the screen andare pivoted to the casing by the pins 70.

L are levers pivoted to the said levers K and provided with long slots Zin their free ends.

M are thumb-serews which pass through the said slots and connect thelevers L with the casing, so that the position of the brush can bevaried to make it bear with greater or less pressure against the screen,or to swing out of contact with it altogether.

\Vhat I claim is-- 1. The combination of the cylindrical wire screen,the fiat bands secured to the ends of the screen, the middledriving-band of larger diameter than the end bands, the drivingshaftssituated below the screen, one on each side of it, the flat-faced wheelssupporting the ends of the screen, and the driving-wheels engaging withthe said middle driving-band, substantially as and for the purpose setforth.

2. The combination of the inclined cylindrical Wire screen, the flatbands secured to the ends of the screen, the middle drivingband oflarger diameter than the end bands,

and provided with the circumferential V- shaped projection, thelongitudinal bars uniting the middle and end bands, the driving-shaftssituated below the screen, one on each side of it, the fiat-faced wheelssupporting the ends of the screen, and the grooved driving-Wheelsengaging with the said proj ection on the middle driving-band,substantially as and for the purpose set forth.

3. The combination of two parallel drivingshafts, three wheels securedupon each shaft,

and a cylindrical screen provided with middle and end bands, supportedupon the said Wheels and bearing hardest upon the middle Wheels, wherebythe screen is driven from the i 5 middle, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

VVINFIELD O. GUN CKEL.

Witnesses:

ERWIN S. EMRY, O. T. NOBLE.

